| Paper |
Title |
Page |
| TUPO098 |
Proof-of-Principle Tests for Slit-scan-based Slice Emittance Measurements at PITZ |
553 |
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- R. Niemczyk, P. Boonpornprasert, Y. Chen, J.D. Good, M. Groß, H. Huck, I.I. Isaev, D.K. Kalantaryan, C. Koschitzki, M. Krasilnikov, X. Li, O. Lishilin, G. Loisch, D. Melkumyan, A. Oppelt, H.J. Qian, Y. Renier, C. Saisa-ard, F. Stephan, Q.T. Zhao
DESY Zeuthen, Zeuthen, Germany
- W. Hillert
University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany
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Transverse slice emittance is one of the most important properties of high-brightness electron beams for freeelectron lasers (FELs). The photo injector test facility at DESY in Zeuthen (PITZ) develops high-brightness electron sources for modern FELs. With a 23 MeV, 1 nC beam at PITZ the experimental slice emittance characterization with the quadrupole scan technique is complicated by strong space charge effects. Combining the slit scan technique with a transverse deflecting cavity (TDS) allows for timeresolved emittance measurements of such a space-chargedominated beam. The first proof-of-principle results of slice emittance measurements at PITZ based on the ’TDS + slit scan’-technique are presented in this paper.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO098
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| About • |
paper received ※ 04 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019 |
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| THPO118 |
Beam Transverse Coupling and 4D Emittance Measurement Simulation Studies for PITZ |
945 |
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- Q.T. Zhao, M. Krasilnikov, H.J. Qian, F. Stephan
DESY Zeuthen, Zeuthen, Germany
- Q.T. Zhao
IMP/CAS, Lanzhou, People’s Republic of China
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The Photo Injector Test Facility at DESY, Zeuthen site (PITZ) was built to test and optimize high brightness electron sources for Free Electron Lasers (FELs) like FLASH and the European XFEL. Although the beam emittance has been optimized and experimentally demonstrated to meet the requirements of FLASH and XFEL, transverse beam asymmetries were observed during operation of the RF guns. Based on previous studies [1], the beam asymmetries most probably stem from beam transverse coupling by quadrupole field errors in the gun section. A pair of normal and skew gun quadrupoles was successfully used for reducing the beam asymmetries in experiment. In this paper, we discuss the beam transverse coupling between X and Y planes due to quadrupole field errors and its impact onto horizontal and vertical rms emittance. Multi-quads scan and two quads with rotated slits scan were proposed to measure the 4D beam matrix for PITZ and tested by simulation, which will give the residual beam coupling after gun quadrupoles compensation and would be helpful for minimizing the 2D rms emittance experimentally.
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Poster THPO118 [1.521 MB]
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-LINAC2018-THPO118
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|
| About • |
paper received ※ 08 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019 |
|
| Export • |
reference for this paper using
※ BibTeX,
※ LaTeX,
※ Text/Word,
※ RIS,
※ EndNote (xml)
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